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<FONT color="green">001</FONT>    package gates;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    /**<a name="line.3"></a>
<FONT color="green">004</FONT>     * Factory class to produce gate objects. Constructors for the gates should be private so this<a name="line.4"></a>
<FONT color="green">005</FONT>     * should be the only way to create gate objects.<a name="line.5"></a>
<FONT color="green">006</FONT>     * The static boolean &lt;code&gt;functional&lt;/code&gt; determines if matrix or functional representations<a name="line.6"></a>
<FONT color="green">007</FONT>     * of the gates are return, depending on what is available to use.<a name="line.7"></a>
<FONT color="green">008</FONT>     * E.g. if &lt;code&gt;functional&lt;/code&gt; is true and no functional representation is available, then<a name="line.8"></a>
<FONT color="green">009</FONT>     * a matrix representation is returned.<a name="line.9"></a>
<FONT color="green">010</FONT>     * Since all complex gates can be constructed from multiple primitive gates, the gates available<a name="line.10"></a>
<FONT color="green">011</FONT>     * should be able to construct any quantum circuit.<a name="line.11"></a>
<FONT color="green">012</FONT>     * @author Alex Bush, Jan Zaucha<a name="line.12"></a>
<FONT color="green">013</FONT>     *<a name="line.13"></a>
<FONT color="green">014</FONT>     */<a name="line.14"></a>
<FONT color="green">015</FONT>    public final class Factory {<a name="line.15"></a>
<FONT color="green">016</FONT>            /**<a name="line.16"></a>
<FONT color="green">017</FONT>             * Static boolean that determines is a function representation is returned or not.<a name="line.17"></a>
<FONT color="green">018</FONT>             * By default, this is set to true as there are performance benefits, however majority of gates<a name="line.18"></a>
<FONT color="green">019</FONT>             * will only have a matrix representation.<a name="line.19"></a>
<FONT color="green">020</FONT>             */<a name="line.20"></a>
<FONT color="green">021</FONT>            public static boolean functional = true;<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>            /**<a name="line.24"></a>
<FONT color="green">025</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all hadamard gates.<a name="line.25"></a>
<FONT color="green">026</FONT>             * Default for &lt;code&gt;hadamardmatrix&lt;/code&gt; is false<a name="line.26"></a>
<FONT color="green">027</FONT>             */<a name="line.27"></a>
<FONT color="green">028</FONT>            public static boolean hadamardmatrix = false;<a name="line.28"></a>
<FONT color="green">029</FONT>            /**<a name="line.29"></a>
<FONT color="green">030</FONT>             * Create a hadamard &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.30"></a>
<FONT color="green">031</FONT>             * Requires a target bit to operate. If the gate acts on the whole<a name="line.31"></a>
<FONT color="green">032</FONT>             * register, target bit is -1.<a name="line.32"></a>
<FONT color="green">033</FONT>             * @param target Target bits<a name="line.33"></a>
<FONT color="green">034</FONT>             */<a name="line.34"></a>
<FONT color="green">035</FONT>            public static Gate createHadamard(int target){<a name="line.35"></a>
<FONT color="green">036</FONT>                    if (hadamardmatrix){<a name="line.36"></a>
<FONT color="green">037</FONT>                            return (Gate)new HadamardMatrix(target);<a name="line.37"></a>
<FONT color="green">038</FONT>                    }<a name="line.38"></a>
<FONT color="green">039</FONT>                    else if(functional){<a name="line.39"></a>
<FONT color="green">040</FONT>                            return (Gate)new HadamardFunction(target);<a name="line.40"></a>
<FONT color="green">041</FONT>                    }<a name="line.41"></a>
<FONT color="green">042</FONT>                    else {<a name="line.42"></a>
<FONT color="green">043</FONT>                            return (Gate)new HadamardMatrix(target);<a name="line.43"></a>
<FONT color="green">044</FONT>                    }<a name="line.44"></a>
<FONT color="green">045</FONT>            }<a name="line.45"></a>
<FONT color="green">046</FONT>    <a name="line.46"></a>
<FONT color="green">047</FONT>            /**<a name="line.47"></a>
<FONT color="green">048</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all CNot gates.<a name="line.48"></a>
<FONT color="green">049</FONT>             * Default for &lt;code&gt;cnotmatrix&lt;/code&gt; is false<a name="line.49"></a>
<FONT color="green">050</FONT>             */<a name="line.50"></a>
<FONT color="green">051</FONT>            public static boolean cnotmatrix = false;<a name="line.51"></a>
<FONT color="green">052</FONT>            /**Create a CNot &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.52"></a>
<FONT color="green">053</FONT>             * <a name="line.53"></a>
<FONT color="green">054</FONT>             * @param control - control bit<a name="line.54"></a>
<FONT color="green">055</FONT>             * @param target - target bit<a name="line.55"></a>
<FONT color="green">056</FONT>             */<a name="line.56"></a>
<FONT color="green">057</FONT>            public static Gate createCNot (int control, int target){<a name="line.57"></a>
<FONT color="green">058</FONT>                    if (cnotmatrix){<a name="line.58"></a>
<FONT color="green">059</FONT>                            return (Gate)new CnotMatrix(control,target);<a name="line.59"></a>
<FONT color="green">060</FONT>                    }<a name="line.60"></a>
<FONT color="green">061</FONT>                    else if (functional){<a name="line.61"></a>
<FONT color="green">062</FONT>                            return (Gate)new CnotFunction(control,target);<a name="line.62"></a>
<FONT color="green">063</FONT>                    }<a name="line.63"></a>
<FONT color="green">064</FONT>                    else {<a name="line.64"></a>
<FONT color="green">065</FONT>                            return (Gate)new CnotMatrix(control,target);<a name="line.65"></a>
<FONT color="green">066</FONT>                    }<a name="line.66"></a>
<FONT color="green">067</FONT>            }<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>            /**<a name="line.69"></a>
<FONT color="green">070</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all phase gates.<a name="line.70"></a>
<FONT color="green">071</FONT>             * Default for &lt;code&gt;phasematrix&lt;/code&gt; is false<a name="line.71"></a>
<FONT color="green">072</FONT>             */<a name="line.72"></a>
<FONT color="green">073</FONT>            public static boolean phasematrix = false;<a name="line.73"></a>
<FONT color="green">074</FONT>            /**Create a Phase Shift &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.74"></a>
<FONT color="green">075</FONT>             * <a name="line.75"></a>
<FONT color="green">076</FONT>             * @param target - target qubit<a name="line.76"></a>
<FONT color="green">077</FONT>             * @param phi - angle of phase shift<a name="line.77"></a>
<FONT color="green">078</FONT>             */<a name="line.78"></a>
<FONT color="green">079</FONT>            public static Gate createPhaseShift (int target, double phi){<a name="line.79"></a>
<FONT color="green">080</FONT>                    if (phasematrix){<a name="line.80"></a>
<FONT color="green">081</FONT>                            return (Gate)new PhaseShiftMatrix(target,phi);<a name="line.81"></a>
<FONT color="green">082</FONT>                    }<a name="line.82"></a>
<FONT color="green">083</FONT>                    else if (functional){<a name="line.83"></a>
<FONT color="green">084</FONT>                            return (Gate)new PhaseShiftFunction(target,phi);<a name="line.84"></a>
<FONT color="green">085</FONT>                    }<a name="line.85"></a>
<FONT color="green">086</FONT>                    else{<a name="line.86"></a>
<FONT color="green">087</FONT>                            return (Gate)new PhaseShiftMatrix(target,phi);<a name="line.87"></a>
<FONT color="green">088</FONT>                    }<a name="line.88"></a>
<FONT color="green">089</FONT>            }<a name="line.89"></a>
<FONT color="green">090</FONT>    <a name="line.90"></a>
<FONT color="green">091</FONT>            /**<a name="line.91"></a>
<FONT color="green">092</FONT>             * Create a composite &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.92"></a>
<FONT color="green">093</FONT>             * Must provide an array of Gates to create a composite gate. Any of these gates can be<a name="line.93"></a>
<FONT color="green">094</FONT>             * a composite gate itself.<a name="line.94"></a>
<FONT color="green">095</FONT>             * @param gates Array of gate objects<a name="line.95"></a>
<FONT color="green">096</FONT>             */<a name="line.96"></a>
<FONT color="green">097</FONT>            public static Gate createComposite(Gate[] gates){<a name="line.97"></a>
<FONT color="green">098</FONT>                    return new CompositeGate(gates);<a name="line.98"></a>
<FONT color="green">099</FONT>            }<a name="line.99"></a>
<FONT color="green">100</FONT>    <a name="line.100"></a>
<FONT color="green">101</FONT>            <a name="line.101"></a>
<FONT color="green">102</FONT>            /**<a name="line.102"></a>
<FONT color="green">103</FONT>             * Create a composite GroverIteration &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.103"></a>
<FONT color="green">104</FONT>             * All embedded gates are created automatically and this iteration is self containing.<a name="line.104"></a>
<FONT color="green">105</FONT>             * Gates are created using this Factory class so usual rules of &lt;code&gt;functional/matrix&lt;/code&gt; representation<a name="line.105"></a>
<FONT color="green">106</FONT>             * apply.<a name="line.106"></a>
<FONT color="green">107</FONT>             * @param searched Searched element in the algorithm<a name="line.107"></a>
<FONT color="green">108</FONT>             * @param numQubits Number of qubits in the algorithm<a name="line.108"></a>
<FONT color="green">109</FONT>             */<a name="line.109"></a>
<FONT color="green">110</FONT>            public static Gate createGroverIteration(int searched,int numQubits){<a name="line.110"></a>
<FONT color="green">111</FONT>                    return new GroverComposite(searched, numQubits);<a name="line.111"></a>
<FONT color="green">112</FONT>            }<a name="line.112"></a>
<FONT color="green">113</FONT>            <a name="line.113"></a>
<FONT color="green">114</FONT>            /**<a name="line.114"></a>
<FONT color="green">115</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all iteration gates.<a name="line.115"></a>
<FONT color="green">116</FONT>             * Default for &lt;code&gt;oraclematrix&lt;/code&gt; is false and hence fall back onto &lt;code&gt;functional&lt;/code&gt; boolean<a name="line.116"></a>
<FONT color="green">117</FONT>             */<a name="line.117"></a>
<FONT color="green">118</FONT>            public static boolean oraclematrix = false;<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>            /**<a name="line.120"></a>
<FONT color="green">121</FONT>             * Create an oracle gate, used in the functional representation of the groverFuncion gate.<a name="line.121"></a>
<FONT color="green">122</FONT>             * @param searched Searched state the iteration is looking for<a name="line.122"></a>
<FONT color="green">123</FONT>             */<a name="line.123"></a>
<FONT color="green">124</FONT>            public static Gate createOracle(int searched){<a name="line.124"></a>
<FONT color="green">125</FONT>                    if (oraclematrix){<a name="line.125"></a>
<FONT color="green">126</FONT>                            return (Gate)new OracleMatrix(searched);<a name="line.126"></a>
<FONT color="green">127</FONT>                    }<a name="line.127"></a>
<FONT color="green">128</FONT>                    else if (functional){<a name="line.128"></a>
<FONT color="green">129</FONT>                            return (Gate)new OracleFunction(searched);<a name="line.129"></a>
<FONT color="green">130</FONT>                    }<a name="line.130"></a>
<FONT color="green">131</FONT>                    else{<a name="line.131"></a>
<FONT color="green">132</FONT>                            return (Gate)new OracleMatrix(searched);<a name="line.132"></a>
<FONT color="green">133</FONT>                    }<a name="line.133"></a>
<FONT color="green">134</FONT>            }<a name="line.134"></a>
<FONT color="green">135</FONT>            <a name="line.135"></a>
<FONT color="green">136</FONT>            /**<a name="line.136"></a>
<FONT color="green">137</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all iteration gates.<a name="line.137"></a>
<FONT color="green">138</FONT>             * Default for &lt;code&gt;complexImatrix&lt;/code&gt; is false and hence fall back onto &lt;code&gt;functional&lt;/code&gt; boolean<a name="line.138"></a>
<FONT color="green">139</FONT>             */<a name="line.139"></a>
<FONT color="green">140</FONT>            public static boolean complexImatrix = false;<a name="line.140"></a>
<FONT color="green">141</FONT>            <a name="line.141"></a>
<FONT color="green">142</FONT>            /**<a name="line.142"></a>
<FONT color="green">143</FONT>             * Create a iI gate, used in the representation of the grover iteration in terms of universal gates.<a name="line.143"></a>
<FONT color="green">144</FONT>             * @param target Target qubit<a name="line.144"></a>
<FONT color="green">145</FONT>             */<a name="line.145"></a>
<FONT color="green">146</FONT>            public static Gate createComplexIdentity(int target){<a name="line.146"></a>
<FONT color="green">147</FONT>                    if (complexImatrix){<a name="line.147"></a>
<FONT color="green">148</FONT>                            return (Gate)new ComplexIdentityMatrix(target);<a name="line.148"></a>
<FONT color="green">149</FONT>                    }<a name="line.149"></a>
<FONT color="green">150</FONT>                    else if (functional){<a name="line.150"></a>
<FONT color="green">151</FONT>                            return (Gate)new ComplexIdentityFunction(target);<a name="line.151"></a>
<FONT color="green">152</FONT>                    }<a name="line.152"></a>
<FONT color="green">153</FONT>                    else{<a name="line.153"></a>
<FONT color="green">154</FONT>                            return (Gate)new ComplexIdentityMatrix(target);<a name="line.154"></a>
<FONT color="green">155</FONT>                    }<a name="line.155"></a>
<FONT color="green">156</FONT>    <a name="line.156"></a>
<FONT color="green">157</FONT>            }<a name="line.157"></a>
<FONT color="green">158</FONT>            /**<a name="line.158"></a>
<FONT color="green">159</FONT>             * Overwrite the global &lt;code&gt;groverbasicgates&lt;/code&gt; variable for all grover iteration gates.<a name="line.159"></a>
<FONT color="green">160</FONT>             * Default for &lt;code&gt;groverbasicgates&lt;/code&gt; is false and hence gates are most efficient by default<a name="line.160"></a>
<FONT color="green">161</FONT>             * This boolean superseeds &lt;code&gt;grovermatrix&lt;/code&gt; and &lt;code&gt;functional&lt;/code&gt; so if &lt;code&gt;groverbasicgates&lt;/code&gt;, &lt;code&gt;grovermatrix&lt;/code&gt; and &lt;code&gt;functional&lt;/code&gt;<a name="line.161"></a>
<FONT color="green">162</FONT>             * are all set to true, the grover representation will be of basic gates.<a name="line.162"></a>
<FONT color="green">163</FONT>             */<a name="line.163"></a>
<FONT color="green">164</FONT>            public static boolean groverbasicgates = false;<a name="line.164"></a>
<FONT color="green">165</FONT>            <a name="line.165"></a>
<FONT color="green">166</FONT>            <a name="line.166"></a>
<FONT color="green">167</FONT>            /**<a name="line.167"></a>
<FONT color="green">168</FONT>             * Create a nand gate that flips all states except the first.<a name="line.168"></a>
<FONT color="green">169</FONT>             *  @param numQubits Number of qubits in register <a name="line.169"></a>
<FONT color="green">170</FONT>             */<a name="line.170"></a>
<FONT color="green">171</FONT>            public static Gate createNand(int numQubits){<a name="line.171"></a>
<FONT color="green">172</FONT>                    if(groverbasicgates){<a name="line.172"></a>
<FONT color="green">173</FONT>                            return new NandComposite(numQubits);<a name="line.173"></a>
<FONT color="green">174</FONT>                    }<a name="line.174"></a>
<FONT color="green">175</FONT>                    else if(functional){<a name="line.175"></a>
<FONT color="green">176</FONT>                            return new NandAllFunction();<a name="line.176"></a>
<FONT color="green">177</FONT>                    }<a name="line.177"></a>
<FONT color="green">178</FONT>                    <a name="line.178"></a>
<FONT color="green">179</FONT>                    else{<a name="line.179"></a>
<FONT color="green">180</FONT>                            return new NandAllMatrix();<a name="line.180"></a>
<FONT color="green">181</FONT>                    }<a name="line.181"></a>
<FONT color="green">182</FONT>            }<a name="line.182"></a>
<FONT color="green">183</FONT>            /**<a name="line.183"></a>
<FONT color="green">184</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all not gates.<a name="line.184"></a>
<FONT color="green">185</FONT>             * Default for &lt;code&gt;notmatrix&lt;/code&gt; is false<a name="line.185"></a>
<FONT color="green">186</FONT>             */<a name="line.186"></a>
<FONT color="green">187</FONT>            public static boolean notmatrix=false;<a name="line.187"></a>
<FONT color="green">188</FONT>            /**<a name="line.188"></a>
<FONT color="green">189</FONT>             * Create a NOT gate<a name="line.189"></a>
<FONT color="green">190</FONT>             * @param target Target qubit of the gate<a name="line.190"></a>
<FONT color="green">191</FONT>             */<a name="line.191"></a>
<FONT color="green">192</FONT>            public static Gate createNot(int target){<a name="line.192"></a>
<FONT color="green">193</FONT>                    if(notmatrix){<a name="line.193"></a>
<FONT color="green">194</FONT>                            return (Gate)new NotMatrix(target);<a name="line.194"></a>
<FONT color="green">195</FONT>                    }<a name="line.195"></a>
<FONT color="green">196</FONT>                    else if (functional){<a name="line.196"></a>
<FONT color="green">197</FONT>                            return (Gate)new NotFunction(target);<a name="line.197"></a>
<FONT color="green">198</FONT>                    }<a name="line.198"></a>
<FONT color="green">199</FONT>                    else{<a name="line.199"></a>
<FONT color="green">200</FONT>                            return (Gate)new NotMatrix(target);<a name="line.200"></a>
<FONT color="green">201</FONT>                    }<a name="line.201"></a>
<FONT color="green">202</FONT>            }<a name="line.202"></a>
<FONT color="green">203</FONT>    <a name="line.203"></a>
<FONT color="green">204</FONT>            /**<a name="line.204"></a>
<FONT color="green">205</FONT>             * Create a new measurement gate.<a name="line.205"></a>
<FONT color="green">206</FONT>             */<a name="line.206"></a>
<FONT color="green">207</FONT>            public static Gate createMeasurement(){<a name="line.207"></a>
<FONT color="green">208</FONT>                    return new Measurement();<a name="line.208"></a>
<FONT color="green">209</FONT>            }<a name="line.209"></a>
<FONT color="green">210</FONT>            /**<a name="line.210"></a>
<FONT color="green">211</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all allcnot gates.<a name="line.211"></a>
<FONT color="green">212</FONT>             * Default for &lt;code&gt;allcnotmatrix&lt;/code&gt; is false<a name="line.212"></a>
<FONT color="green">213</FONT>             */<a name="line.213"></a>
<FONT color="green">214</FONT>            public static boolean allcnotmatrix=false;<a name="line.214"></a>
<FONT color="green">215</FONT>            <a name="line.215"></a>
<FONT color="green">216</FONT>            /**<a name="line.216"></a>
<FONT color="green">217</FONT>             * Create an All-C Not gate.<a name="line.217"></a>
<FONT color="green">218</FONT>             * @param target Target qubit of the gate<a name="line.218"></a>
<FONT color="green">219</FONT>             */<a name="line.219"></a>
<FONT color="green">220</FONT>            public static Gate createAllCnot(int target){<a name="line.220"></a>
<FONT color="green">221</FONT>                    if (allcnotmatrix){<a name="line.221"></a>
<FONT color="green">222</FONT>                            return (Gate)new AllCnotMatrix(target);<a name="line.222"></a>
<FONT color="green">223</FONT>                    }<a name="line.223"></a>
<FONT color="green">224</FONT>                    else if (functional){<a name="line.224"></a>
<FONT color="green">225</FONT>                            return (Gate)new AllCnotFunction(target);<a name="line.225"></a>
<FONT color="green">226</FONT>                    }<a name="line.226"></a>
<FONT color="green">227</FONT>                    else{<a name="line.227"></a>
<FONT color="green">228</FONT>                            return (Gate)new AllCnotMatrix(target);<a name="line.228"></a>
<FONT color="green">229</FONT>                    }<a name="line.229"></a>
<FONT color="green">230</FONT>            }<a name="line.230"></a>
<FONT color="green">231</FONT>    <a name="line.231"></a>
<FONT color="green">232</FONT>            /**<a name="line.232"></a>
<FONT color="green">233</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all Z Pauli gates.<a name="line.233"></a>
<FONT color="green">234</FONT>             * Default for &lt;code&gt;Zmatrix&lt;/code&gt; is false<a name="line.234"></a>
<FONT color="green">235</FONT>             */<a name="line.235"></a>
<FONT color="green">236</FONT>            public static boolean Zmatrix = false;<a name="line.236"></a>
<FONT color="green">237</FONT>            /**Create a Z &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.237"></a>
<FONT color="green">238</FONT>             * <a name="line.238"></a>
<FONT color="green">239</FONT>             * @param target - target qubit<a name="line.239"></a>
<FONT color="green">240</FONT>             */<a name="line.240"></a>
<FONT color="green">241</FONT>            public static Gate createZ(int target){<a name="line.241"></a>
<FONT color="green">242</FONT>                    if (Zmatrix){<a name="line.242"></a>
<FONT color="green">243</FONT>                            return (Gate)new ZMatrix(target);<a name="line.243"></a>
<FONT color="green">244</FONT>                    }<a name="line.244"></a>
<FONT color="green">245</FONT>                    else if (functional){<a name="line.245"></a>
<FONT color="green">246</FONT>                            return (Gate)new ZFunction(target);<a name="line.246"></a>
<FONT color="green">247</FONT>                    }<a name="line.247"></a>
<FONT color="green">248</FONT>                    else{<a name="line.248"></a>
<FONT color="green">249</FONT>                            return (Gate)new ZMatrix(target);<a name="line.249"></a>
<FONT color="green">250</FONT>                    }<a name="line.250"></a>
<FONT color="green">251</FONT>            }<a name="line.251"></a>
<FONT color="green">252</FONT>            <a name="line.252"></a>
<FONT color="green">253</FONT>            /**<a name="line.253"></a>
<FONT color="green">254</FONT>             * Overwrite the global &lt;code&gt;functional&lt;/code&gt; variable for all Y Pauli gates.<a name="line.254"></a>
<FONT color="green">255</FONT>             * Default for &lt;code&gt;Ymatrix&lt;/code&gt; is false<a name="line.255"></a>
<FONT color="green">256</FONT>             */<a name="line.256"></a>
<FONT color="green">257</FONT>            public static boolean Ymatrix = false;<a name="line.257"></a>
<FONT color="green">258</FONT>            /**Create a Z &lt;code&gt;Gate&lt;/code&gt; object and return to the user.<a name="line.258"></a>
<FONT color="green">259</FONT>             * <a name="line.259"></a>
<FONT color="green">260</FONT>             * @param target - target qubit<a name="line.260"></a>
<FONT color="green">261</FONT>             */<a name="line.261"></a>
<FONT color="green">262</FONT>            public static Gate createY(int target){<a name="line.262"></a>
<FONT color="green">263</FONT>                    if (Ymatrix){<a name="line.263"></a>
<FONT color="green">264</FONT>                            return (Gate)new YMatrix(target);<a name="line.264"></a>
<FONT color="green">265</FONT>                    }<a name="line.265"></a>
<FONT color="green">266</FONT>                    else if (functional){<a name="line.266"></a>
<FONT color="green">267</FONT>                            return (Gate)new YFunction(target);<a name="line.267"></a>
<FONT color="green">268</FONT>                    }<a name="line.268"></a>
<FONT color="green">269</FONT>                    else{<a name="line.269"></a>
<FONT color="green">270</FONT>                            return (Gate)new YMatrix(target);<a name="line.270"></a>
<FONT color="green">271</FONT>                    }<a name="line.271"></a>
<FONT color="green">272</FONT>            }<a name="line.272"></a>
<FONT color="green">273</FONT>    <a name="line.273"></a>
<FONT color="green">274</FONT>            /**<a name="line.274"></a>
<FONT color="green">275</FONT>             * Create a T gate, used for creating a toffoli out of composite gates<a name="line.275"></a>
<FONT color="green">276</FONT>             * @param target Target qubit to act on<a name="line.276"></a>
<FONT color="green">277</FONT>             */<a name="line.277"></a>
<FONT color="green">278</FONT>            public static Gate createT(int target){<a name="line.278"></a>
<FONT color="green">279</FONT>                    return new TEnclosing(target);<a name="line.279"></a>
<FONT color="green">280</FONT>            }<a name="line.280"></a>
<FONT color="green">281</FONT>    <a name="line.281"></a>
<FONT color="green">282</FONT>            /**<a name="line.282"></a>
<FONT color="green">283</FONT>             * Create a Tdagger gate, used for creating a toffoli out of composite gates<a name="line.283"></a>
<FONT color="green">284</FONT>             * @param target Target qubit to act on<a name="line.284"></a>
<FONT color="green">285</FONT>             */<a name="line.285"></a>
<FONT color="green">286</FONT>            public static Gate createTDagger(int target){<a name="line.286"></a>
<FONT color="green">287</FONT>                    return new TDaggerEnclosing(target);<a name="line.287"></a>
<FONT color="green">288</FONT>            }<a name="line.288"></a>
<FONT color="green">289</FONT>    <a name="line.289"></a>
<FONT color="green">290</FONT>            /**<a name="line.290"></a>
<FONT color="green">291</FONT>             * Create a S gate, used for creating a toffoli out of composite gates<a name="line.291"></a>
<FONT color="green">292</FONT>             * @param target Target qubit to act on<a name="line.292"></a>
<FONT color="green">293</FONT>             */<a name="line.293"></a>
<FONT color="green">294</FONT>            public static Gate createS(int target){<a name="line.294"></a>
<FONT color="green">295</FONT>                    return new SEnclosing(target);<a name="line.295"></a>
<FONT color="green">296</FONT>            }<a name="line.296"></a>
<FONT color="green">297</FONT>            /**<a name="line.297"></a>
<FONT color="green">298</FONT>             * Overwrite the global &lt;code&gt;basicgates&lt;/code&gt; variable for all Toffoli gates.<a name="line.298"></a>
<FONT color="green">299</FONT>             * Default for &lt;code&gt;Toffolibasicgates&lt;/code&gt; is false<a name="line.299"></a>
<FONT color="green">300</FONT>             */<a name="line.300"></a>
<FONT color="green">301</FONT>            public static boolean Toffolibasicgates = false;<a name="line.301"></a>
<FONT color="green">302</FONT>    <a name="line.302"></a>
<FONT color="green">303</FONT>            /**<a name="line.303"></a>
<FONT color="green">304</FONT>             * Create a Toffoli gate or a C-C-Not gate<a name="line.304"></a>
<FONT color="green">305</FONT>             * @param control1 First control bit<a name="line.305"></a>
<FONT color="green">306</FONT>             * @param control2 Second control bit<a name="line.306"></a>
<FONT color="green">307</FONT>             * @param target Target bit<a name="line.307"></a>
<FONT color="green">308</FONT>             */<a name="line.308"></a>
<FONT color="green">309</FONT>            public static Gate createToffoli(int control1, int control2, int target){<a name="line.309"></a>
<FONT color="green">310</FONT>                    if (Toffolibasicgates){<a name="line.310"></a>
<FONT color="green">311</FONT>                            return new ToffoliComposite(control1, control2, target);<a name="line.311"></a>
<FONT color="green">312</FONT>                    }<a name="line.312"></a>
<FONT color="green">313</FONT>                    else{<a name="line.313"></a>
<FONT color="green">314</FONT>                            return new ToffoliFunction(control1, control2, target);<a name="line.314"></a>
<FONT color="green">315</FONT>                    }<a name="line.315"></a>
<FONT color="green">316</FONT>            }<a name="line.316"></a>
<FONT color="green">317</FONT>    }<a name="line.317"></a>




























































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